a rather nappy type of mullet carefully trimed so that the hair in the middle at the base of the skull forms a single, disturbingly long, strand resembling that of a rat's tail; often spotted on young ratty looking children whose parents don't know any better than to get them a decent haircut

That redneck over there has a nasty rat tail.
Woah, check out the rat tail at three o'clock.

That snake looking thing that hangs on the back of a shaved kids head, usually stemming from gangster parent's or brown lip liner wearing mothers. Rat-Tail may further be used as a name that represents whoever sports it. A patch of hair that for some odd reasons signifies god knows what while the bald part is covered with a panty hoe or doo-rag!!! Originated in L.A. usually in hispanics and has viciously infected young children's schools across the nation. These kids are known for bullying and cursing in class.

A fight broke out in class, that lil rat-tail stood up and told the teacher off.